Can't properly UV Unwrap (Black spots)
Depending on which unwrap method you used (unwrap, Smart UV project, etc), faces may not be aligned. This is what appears to have happened to you. Good ways to ensure consistency when unwrapping: 


In object mode, apply rotation &amp; scale (Ctrl + A)
In edit mode, select an edge (pref. facing away from camera)
Search (Ctrl + F) for "mark seam"
Select all geometry 
Unwrap again (Smart UV project)
Adjust Smart UV project parameters as necessary 


This should solve the major distortion of your UV map. Unwrapping is a tricky business—I'd recommend Gleb Alexandrov's YouTube tuts for finer details.